epididymis morphology trait epididymis molecular composition trait 2026-01-13T20:04:20Z Trait.ontology VT:0011272 Any measurable or observable characteristic related to the proportions of proteins, minerals, nutrients, gases, or other substances in the elongated structure connected to the posterior surface of the testes that transports, stores, and matures spermatozoa between testes and vas deferens.